title: 2-Cyano-1-methyl-pyridinium iodide.
abstract: The cation in the title compound, C7H7N2 (+)·I(-), is planar (r.m.s. deviation for the nine fitted non-H atoms = 0.040 Å). The crystal packing is best described as undulating layers of cations and anions associated via C-H⋯I inter-actions.
authors.affiliation: Department of Physics, Loyola University, New Orleans, LA 70118, USA.
authors.forename: Michael N
authors.initials: MN
authors.lastname: Kammer
authors.forename: Lynn V
authors.initials: LV
authors.lastname: Koplitz
authors.forename: Joel T
authors.initials: JT
authors.lastname: Mague